Stretching bones ringing may be caused by the following reasons: 1. It may be caused by the pressure change inside the joint. Before stretching, often a long period of braking, such as sitting somewhere or lying somewhere for a long time, and in the stretching, due to the rapid change in pressure inside the joint, it is possible to produce some strange sound around the bone. 2, this situation may be caused by the misalignment of small joints, such as in the thoracic spine, cervical spine, etc., if there is a misalignment of small joints, in the process of stretching, may This condition may also be caused by a fracture of the isthmus of the lumbar spine. Such diseases are often due to congenital hereditary factors or acquired lumbar trauma, resulting in fracture of the isthmus of the lumbar vertebrae. At this time there will be lumbar vertebral instability, in the process of stretching may induce this instability aggravated, which in turn leads to strange sound.